UPDATE: For people with the same problem that stmble upon this thread
I have given up on trying to passthrough the HD Graphics, i have instead purchased the lowest power-concuption dedicated GPU i can find: Radeon HD6450 (passive cooled DDR3). With this new GPU i can finally passthrough graphics to my VM however i MUST have the following settings in BIOS:
- Disable onboard iGPU HD Graphics
- Disable onboard HD Audio
Working with: ESXi 5.5U1 build 1623387
Once the above two BIOS settings are disabled, i am was successful in passing through the Radeon HD6450 to a Winodws 8 64-bit test VM.
To get my oboard USB controller to work in passthrough mode, i had to create this VM with EFI instead of normal BIOS.
Current problem: When i increase the VM ram from 2GB to 4GB, the VM will fail to boot. EFI claims unsuccessful for any boot option.
For now i can live with the 2GB ram limitation, I will be seeing if Arch Linux or Ubuntu is able to do better.